2006A&A...451..961R


Query : 2006A&A...451..961R

2006A&A...451..961R - Astronomy and Astrophysics, volume 451, 961-971 (2006/6-1)

Properties of dust in the high-latitude translucent cloud L1780. I. Spatially distinct dust populations and increased dust emissivity from ISO observations.

RIDDERSTAD M., JUVELA M., LEHTINEN K., LEMKE D. and LILJESTROEM T.

Abstract (from CDS):

We have analyzed the properties of dust in the high galactic latitude translucent cloud Lynds 1780 using ISOPHOT maps at 100µm and 200µm and raster scans at 60µm, 80µm, 100µm, 120µm, 150µm and 200µm. In far-infrared (FIR) emission, the cloud has a single core that coincides with the maxima of visual extinction and 200µm optical depth. At the resolution of 3.0', the maximum visual extinction is 4.0mag. At the cloud core, the minimum temperature and the maximum 200µm optical depth are 14.9±0.4K and 2.0±0.2x10–3, respectively, at the resolution of 1.5'. The cloud mass is estimated to be 18M. The FIR observations, combined with IRAS observations, suggest the presence of different, spatially distinct dust grain populations in the cloud: the FIR core region is the realm of the ``classical'' large grains, whereas the very small grains and the PAHs have separate maxima on the Eastern side of the cold core, towards the ``tail'' of this cometary-shaped cloud. The color ratios indicate an overabundance of PAHs and VSGs in L1780. Our FIR observations combined with the optical extinction data indicate an increase of the emissivity of the big grain dust component in the cold core, suggesting grain coagulation or some other change in the properties of the large grains. Based on our observations, we also address the question, to what extent the 80µm emission and even the 100µm and the 120µm emission contain a contribution from the small-grain component.

Abstract Copyright:

Journal keyword(s): ISM: clouds - infrared: ISM - ISM: individual objects: L1780

Simbad objects: 15

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Number of rows : 15
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 BD+44 4548 PM* 00 05 10.8891772602 +45 47 11.639549811   11.45   9.2   M2Ve 143 0
2 HD 44179 pA* 06 19 58.2185496 -10 38 14.706068 9.51 9.33 9.02     B9Ib/II 727 0
3 NAME Chamaeleon Region SFR 11 55 -78.0           ~ 716 0
4 NAME Coalsack Nebula DNe 12 31 19 -63 44.6           ~ 247 0
5 LDN 1780 DNe 15 39.7 -07 10           ~ 73 0
6 LDN 1778 DNe 15 39.9 -07 10           ~ 17 0
7 BD-06 4259 * 15 41 00.9741808727 -07 19 09.543131955   11.14 9.39     M2 2 0
8 LDN 169 DNe 15 52.6 -03 19           ~ 23 0
9 LDN 134 MoC 15 53 36.3 -04 35 26           ~ 196 0
10 LDN 183 MoC 15 54 12.2 -02 49 42           ~ 707 1
11 NAME Upper Sco Association As* 16 12 -23.4           ~ 1114 1
12 NAME ASSOC II SCO As* 16 15 -24.2           ~ 1177 1
13 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3196 1
14 NAME Sco-Oph Region reg 16 30.0 -21 00           ~ 72 0
15 NAME Local Bubble ISM ~ ~           ~ 739 0

    Equat.    Gal    SGal    Ecl

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2021.07.27-08:25:55

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